#app {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

body{
    overflow: hidden;
}

#main-container {
    background: #d3d6dd;
    width: 1920px;
    height: 1080px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transform-origin: left top;
}

.g-bg {
    width: 100%;
    height: 100%;
    background-color: aqua;
}